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Without smartphone users of its app, Twitter (NYSE: TWTR) would barely exist.

According to data collected by Nielsen, the social media network's users spent an average of 3 minutes and 7 seconds on the company's mobile app each month, but only 36 seconds using Twitter on a computer. Facebook (NASDAQ: FB) , which has been succeeding in getting users onto its mobile platform, has a much more balanced user base -- its customers spend 6 minutes and 24 seconds per month using the site via computer and 7 minutes and 43 seconds each month using its app.

Follow the mobile moneyWith overall PC use and sales declining while smartphone and tablet sales grow, the above data is not quite as disastrous for Twitter as it would have been a couple of years ago. Twitter, according to the company's fourth quarter 2013 financial report, had $220 million in advertising revenue; this was an increase of 121% year-over-year. Of that $220 million, 75% of it was mobile advertising. Twitter lost $511 million for the quarter, up from $9 million for the same quarter last year. Much of that loss was due to a one-time charge related to the company going public, however.

In its fourth quarter of 2013 report, Facebook had $2.34 billion in total advertising; this was a 76% increase from the same quarter last year. Mobile ads, however, were 53% of advertising revenue for the quarter, up from approximately 23% of advertising revenue in the fourth quarter of 2012.

Emarketer, which tracks the mobile advertising market, reported in August 2013 that Google (NASDAQ: GOOGL) controls more than half of the $16.65 billion mobile ad market. Facebook is gaining share, however, as is Twiiter. According to Emarketer, Facebook began the year with 5.35% of the market and was projected to end 2013 with 15.8% share. Twitter's gain was less dramatic as it was projected to climb from 1.57% to 1.85%.

Twitter at a crossroadsFacebook, which faced concerns over its ability to monetize mobile customers at the time of its IPO, has successfully answered those arguments. As you can see from the chart above, the company has also done a good job making the site as a useable product on whatever computing device users might access it from.

The same cannot be said of Twitter, as its PC audience barely exists. This makes either reversing that trend or continuing to grow its mobile user base and engagement essential. One possible way to change course is a rumored radical redesign that would make Twitter a lot more like Facebook.

According to an article in The Los Angeles Times, Twitter has begun testing radical new design that looks a lot like rival social media sites Facebook and Google+. The redesign, which has not been announced by the company, "is currently only visible to a few users of the social network, places a bigger emphasis on users' header photos, which are the images located behind their profile photos," reported the Times.

The new design, according to the Times, also has a few other changes:

The Facebook-like profile pages move profile pictures and bios from the right side of the page to a small column on the left of the screen.

The redesign does not display users' tweets in a vertical format. Tweets are laid out similarly to how pins are seen on Pinterest.

A greater emphasis is also placed on tweets that include photos and links.

Below the header photo, users can see how many tweets and photos/videos a user has posted.

There are also counters for followers, users following, favorite tweets, and lists that users belong to.

Of course, a secret test of a new design may just be a test, but testing something so radical suggests that Twitter's leaders know that they have a broken product that's essentially non-existent in the PC world and less engaging than Facebook on mobile. Changing that is not impossible, but as we have seen with so many social media networks before, today's Facebook can easily become tomorrow's Friendster.

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Daniel B. Kline is an accomplished writer and editor who has worked for the Microsoft's Finance app and The Boston Globe, where he wrote for the paper and ran the Boston.com business desk. His latest book "Worst Ideas Ever" (Skyhorse) can be purchased at bookstores everywhere.
Follow @tworstideas